Taxonomic history

Xyleboricus mediosectus Eggers, 1923: 215.

Arixyleborus mediosectus (Eggers): Schedl, 1958c: 145.

Synonyms

Arixyleborus angulatus Schedl, 1942a: 183. Wood, 1989: 170.

Diagnosis

1.9−2.1 mm long (mean = 1.98 mm; n = 5); 2.86−3.33 times as long as wide. This species is distinguished by the protibia posterior face inflated and granulate; antennal club broader than tall; pronotum lateral margin oblique; pronotum anterior margin without serrations; and posterolateral carina acute, granulate.

It can be further distinguished from the closely related A. silvanus by the more elongate form (2.6–2.7 times as long as wide in A. silvanus), more elongate pronotum (1.3 × longer than wide vs 1.1–1.2 times in A. silvanus), the more finely granulate interstriae, and shallowly impressed striae at the apex of the elytral disc, and the presence of short coarse setae on the declivity rather than fine hair-like setae. It can be further distinguished from the closely related A. crassior by the more elongate form (2.5 times as long as wide in A. crassior) and short coarse setae on the declivity.

May be confused with

Arixyleborus crassior, A. phiaoacensis, and A. silvanus

Distribution

‘Borneo’, Cambodia, India (Andaman Is, Assam), Indonesia (Sumatra), Laos, East & West Malaysia, Philippines, Sri Lanka, Thailand, Vietnam

Host plants

polyphagous (Maiti and Saha 2004); It has also been collected from the crop of an edible-nest swiftlet (Collocalia fuciphaga) (Beaver and Browne 1978).

DNA data

specimens not available for sequencing